莫来石纤维/氯氧镁复合材料的制备及增强机理分析

Preparation and enhancement mechanism analysis of mullite fibres/magnesium oxychloride composites

研究了氯氧镁材料的制备工艺。采用长度分别约为250,150和75μm的莫来石纤维增强氯氧镁材料,实验结果表明添加20.0%(质量分数)150μm的莫来石纤维增强效果最好,抗折强度可以达到41.8 MPa,提高192.3%。XRD和SEM分析表明氯氧镁复合材料晶相主要有棒状5Mg(OH)_2·MgCl_2·8H_2O、3Al_2O_3·2SiO_2、MgO和MgCO_3等。分析了莫来石纤维的增强机理。

Preparation processes of magnesium oxychloride materials were researched in this paper. Three kinds of mullite fibres i.e. 250, 150 and 75 μm were used to reinforce the strength of the magnesium oxychloride ma terials, the results show flexural strength of the materials mixed with 20.0wt% 150 μm mullite fibres can be reached to 41.8 MPa, and more 192.3% than without fibres. The composites are characterized by XRD and SEM, the materials are composed of stick like 5Mg（OH）2 · MgCl2·8H2O, 3Al2O3·2SiO2, MgO and MgCO3 crystallines and so on. Enhancement mechanism of the materials were analyzed.